aliases using the appcapappendmemo keyword display their results in a result list with a gray background color instead of the color I defined in the Advanced Visuals for the result list.Below you'll find a shortcut of a normal search without using the appcapappendmemo:

The second image displays the result list with an alias that uses the appcapappendmemo:

Apparently the FCalc plugin uses the keyword also, because it has the same flaw.